We can choose the preferred network type of the SIM card, for example, if there is no or very poor reception under 4G/LTE, we can switch to 3G in order to remain reachable.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  SIM cards & mobile networks
Step 3:  Choose a  SIM card   (Dual SIM)
Step 4:  Tap on  Preferred network type
Step 5:  Choose  Prefer LTE / 3G  or  2G only
  1. Open the Settings
  2. Tap on SIM cards & mobile networks
  3. Choose a SIM card (Dual SIM)
  4. Tap on Preferred network type
  5. Choose Prefer LTE / 3G or 2G only

Xiaomi Instructions
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